Closure disk



Dec. 30 1924' gLosURE DISK Filed NOV- 14' ma @M MM www.

Patented Dec. 30, 1924.

UNITED STATES PATENT OFFICE.`

WI'LBUB I4. WRIGHT, 0F FULTON, NEW YORK, ASSIGNO'R TO OSWEGO FALLSGOBPOB- TION, 0F FULTON, NEW YORK, A CORPORATION OF NEW YORK.

GLOSURE DISK.

Application tiled November 14, 1923. Serial No. 674,644.

To all wko/mit may cof/wcm.'

Be it known that l, WILBUR L. WRIGHT, a citizen of the United States ofAmerica, and resident of Fulton, county ot Oswego, State of New York,have invented certain new and usei'ul improvements in and Relating toClosure Disks, of which the following is a specification.

This invention relates to closure disks in cised at theitop surfaces tooutline portions that can he partially split or stripped from the`topsrof the disks and bent up to :torm relatively thin lift or pulltabs for extracting the disks from the mouths of containers sealedtherebyg andthe objects and nature ot the invention will he readilyunderstood hy those skilled in the art in the light of the followingexplanations of the accompanying drawings that illustrate what l nowbelieve to he the preferred mechanical expression or embodiment oi: myinvention from among other orms and arrangements within the spirit andscope thereofu in object of the invention is to provide a closure diskthat can he applied to closure mouths hy capping machinery, that can heimprinted on its top tace, that can he economically produced in largequantities by machinery, and wherein the top surface of the disk is so'formed that a portion thereotI can be utilized to form a double end ordouble thickness litt usually arranged at the center ot' the disk, thedisk being composed of paper or other material suitable for the purposeandfrom the top side of which, when suitablyincised, relatively thinplies or tabs can he partially stripped or split and bent up to formextracting lift or pull tabs.

With this and. other objects in view, my invention consists in certainnovel features and in constructions and formations as more fully andparticularly set forth and specified hereinafter.

Referring to the accompanying drawings, forming a part hereof:

Fig. 1 shows a closure disk in accordance with my invention, in top planon a somewhat enlarged scale.

Fig. 2 is a similar view showing the incisions continuous under thestaple.

Fig. 3 is a section on the line 3-3, Fig. l, dotted lines showing thecentral double lift as when split from the body of the cap and bent upto cap extracting position.

F ig. 4 is a section on the line 4.-4, Fig. 2.

rl`he closure disk l, is -ilat and more or less stili and elastic and isdesigned to snap into the mouth oi' a container, usually having aninternal sealing shoulder, to seat on such shoulder to seal thecontainer mouth. Closure disks of this general type are usually knowncommercially as milk bottleor jar caps, and are composed generally ot'sos called pulp board or paper material that possesses the peculiarquality ot' readily stripping, splitting or separating into plies orlayers under certain conditions and manipulations. This peouliarity hasbeen taken advantage of in forming such disks, to pron vide portionsthereotl that can he bent up to serve as pull tabs 'for use inextracting the disks rom the container mouths. How ever, to the best ofmy knowledge and intormation, such disks having tab forming portionsintegral therewith, have always provided single end or single ply tabportions that when elevated to litt or extracting position wereconnected at their bases into the edge or peripheral portions of thedisks.

l find that under some conditions and 'for certain purposes, it isdesirable to provide a paper material closure disk with portions Iintegral therewith and capable oi being split therefrom and leent up toform a double end or two ply lift rising trom and connected or coupledtothe center of the disk top and composed of two free end tab portions,each relatively thin and in thickness but a minor fraction of thethickness ot the disk, leaving the disk without openings therethroughand of almost full strength and thickness throughout.

ln the particular example shown, the top of the paper material-disk isincised by two relatively shallow approximately U-shape or approximatelyencircling cuts 2, longitudinally alined with each other diametricallyof the disk ltop and meeting, or approximately meeting, at the center ofthe disk, to outline on the top race oit the disk, an approximatelystraight elongated panel 2 at its opposite ends terminating short of andspaced from the diametrically opposite edge portions of the disk and atthe approximate center of its length crossing the approximate center ofthe disk. The disk is usually compressed at its top side, at 3', to formtop depressions, immediately beyond the extremities of the panel 4,exposing the so-called pick-up vertical end edges 4, of said panel toenable the same to be picked up at its opposite ends, i. e., to ena lethe operator by the use of his finger nail to initiate the splittingoperation by lifting the opposite free ends of the panel 4.

At the centerof the disk, a Wire staple 5, is located, With its straighttop length elongated With respect to the width of the panel and arrangedtransversely across the top surface thereof and projecting beyond thepanel in opposite directions so as to straddle the panel about at thecenter of the length thereof. This staple is driven down through thedisk outside of the panel and beyond the cuts and the ends of the stapleare turned up `or clinched at the under surface of the disk. The stapleis usually pressed into the surfaces of the disk to avoid the formationof yobjectionable projections at the disk 'surfaces. The staple as shownin the drawings is somewhat exaggerated as to size and projection.

The disk making machine usually imprints the top faces of the disks withthe desired indicia, applies andclinches the staples, by suitable bladesand punches, incises, or produces the panel outlining cuts and thedepressions 3 in the top surfaces of the disks, and cuts out the disksfrom the paper material web or sheet.

rThe completed disks go on the market flat and smooth at their top andbottom faces (except for any unobjectionable projection of thestaple)with the panel 4 flat and included inthe body of the disk as shown inFigs. 1, 2, and by full lines in Fig. 3, not beingv split or separatedeven in part from the body of the disk, whereby the disks can be used inthe filling and capping machinery of commerce. The vertical cut 2extends down through the top surface of the disk and enters the body ofthe disk but a slight distance, usually to a depth equal to much lessthan one half the thickness of the disk, so that when the panel is splitfrom thedisk to its central portion, first from one end of the panel andthen from the other end, two free end approximately very thin tabs canbe bent up to form the double end central lift or twin pull tabs 6,indicated by dotted lines liig. 3. A thin top ply of the paper materialwill split from the body of the disk, leaving the disk strong andimperferate, v/hen the panel ends are stripped from the disk and bentup, and the panel may or may not then completely strip from the body ofthe disk up to the straddling staple. The staple prevents the separationof the center of the panel from the disk, which would otherwise occur,before or during the disk extracting pull on the double end tab 6. Bythe location of the straddling staple or equivalent means across thecenter of the panel, the tabs formed by the panel are strengthened andprevented from completely separating from the disk, and by thisarrangement either or both panel ends can be `stripped and bent up toserve as a pull tab Where the ply split from the disk is of suliicientstrength to enable one panel end to serve as a pull tab. In thestructure shown by Fig. 1, the incision formed by cuts 2 vis notcontinued across the top surface of the disk covered by the staple butsaid cuts stop short of the staple.

Fig. 2 shows the incision formed by cuts 2, continuous under the staple,in which even. the incision is made before the staple is applied.

It is evident that various variations might be resorted to withoutdeparting from the spirit and scope of m invention and hence I do notwish to limit myself to the exact disclosures hereof.

That I claim is:

1. A paper material closure disk, of the character substantially asdescribed, Without projections at its top and bottom faces, preventing1ts use in Vcontainer ca ping machinery, said disky having its top aceincised Within the boundaries thereof b a shallow cut forming anelongated panelY formed to be split upwardly from the upper .part of thedisk from both ends toward the center of the panel to form a thin doubleend lift, the disk being provided with means traversing the top face ofthe central portion of tl panel and extending beyond the same to bindthe double end lift to the disk and transmit (tihel extracting pull ofthe double lift to the 2. A paper material vclosure disk having its topface incised Within the boundaries thereof by a shallow cut forming anelongated panel formed to be split upward] from the u per part of thedisk from bot ends tovvar the center of the panel to form a double endlift, means being provided to prevent the center of the panel splittingfrom the body of the disk.

3. An imperforate paper-material closure disk incised at its top face toform an elongated panel, the center of the length of which is locatedapproximately at the center of the disk, and a staple secured to thedisk and transversely1 straddling said panel intermediate its length,said anel formed to split upwardly from the boy of the disk as a thinply from either end toward the staple to form a double end lift tab.

welpen@ il. pape? materiali closure sk having its top 'fece incsedWithin the boundaries thereof ky a shallow cui; oming en elongebed paneomed to be spt upwamly iom bhe uppe' part of the disk from beth endsIewerd the @enter the panel te 'prm e double eed 11i-t9 and e stapledriven hrough and clinched to @he sk and breversng the 'top face of thepanel midway its length.

Ein testimony 'whereof have hereunto sef: my hand at Fulton, N. L? thiswh dey of November, 1923.

WLBUR WRGHT..

